Solution: PH3: Mr. Tambourine Man
Answer: WITCHY

Written by Dana Young

Fill the grid with songs sung by these artists (possibly while part of a musical group) that end with “Man”.

Across
Marcus Mumford (2)
Billy Joel (12)
Neil Diamond (9)
John Belushi (17)
Elton John (10)
John Lennon (4)
Dickey Betts (7)
Ronnie Van Zant (18)
Sammy Davis, Jr. (20)
Ozzy Osbourne (14)
Down
Ricky Nelson (13)
Neil Young (6)
Mick Jagger (5)
Greg Lake (11)
Philippé Wynne (3)
Billy Gibbons (8)
Willie Nelson (16)
Daryl Hall (15)
Joey Ramone (1)
David Bowie (19)

The highlighted letters, taken in the order of the parentheses at the end of the clues, spell:

D
O
N
H
E
N
L
E
Y
T
Y
P
E
O
F
W
O
M
A
N

Don Henley (as a member of The Eagles) sang the song “Witchy Woman”, so the answer is WITCHY.